tofsee | 63e235b92d97d6c3d5a5dca42f31279b674d3140affc1e26c5971d12fc1d7667

General

Target

file.exe
Size

298KB
MD5

b7c137a18093f43fa0ac50865cc34f9c
SHA1

93727de39d92f6934d4ddee26728b207a212428e
SHA256

63e235b92d97d6c3d5a5dca42f31279b674d3140affc1e26c5971d12fc1d7667
SHA512

40683347b6f3dd2f18d15d5bfaa64d98f6ca88d1497bac811483366c59e5c786914dd32445981f774666b20053390f18d5a01f278162ba85bf75866edf6c95d6
SSDEEP

3072:/UgGk8D2CKiH+U3XmE5kDOXkqVDE/zpUp+rqdyy76kgREiwUP7A6qVxWm5iT/Hrq:Ret/X/GDwpELm04B710Ej2qVA8i

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1828 netsh.exe

pid	process
1828	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\gcsnkknd\ImagePath = "C:\\Windows\\SysWOW64\\gcsnkknd\\ilibsuoe.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

file.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

ilibsuoe.exe

pid process

4392 ilibsuoe.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ilibsuoe.exe

description pid process target process

PID 4392 set thread context of 868 4392 ilibsuoe.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

1068 sc.exe
5108 sc.exe
3332 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

2572 116 WerFault.exe file.exe
4640 4392 WerFault.exe ilibsuoe.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
4392	ilibsuoe.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 4392 set thread context of 868	4392	ilibsuoe.exe	svchost.exe

pid	process
1068	sc.exe
5108	sc.exe
3332	sc.exe

pid	pid_target	process	target process
2572	116	WerFault.exe	file.exe
4640	4392	WerFault.exe	ilibsuoe.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exeilibsuoe.exe

description	pid	process	target process
PID 116 wrote to memory of 4380	116	file.exe	cmd.exe
PID 116 wrote to memory of 4380	116	file.exe	cmd.exe
PID 116 wrote to memory of 4380	116	file.exe	cmd.exe
PID 116 wrote to memory of 2184	116	file.exe	cmd.exe
PID 116 wrote to memory of 2184	116	file.exe	cmd.exe
PID 116 wrote to memory of 2184	116	file.exe	cmd.exe
PID 116 wrote to memory of 1068	116	file.exe	sc.exe
PID 116 wrote to memory of 1068	116	file.exe	sc.exe
PID 116 wrote to memory of 1068	116	file.exe	sc.exe
PID 116 wrote to memory of 5108	116	file.exe	sc.exe
PID 116 wrote to memory of 5108	116	file.exe	sc.exe
PID 116 wrote to memory of 5108	116	file.exe	sc.exe
PID 116 wrote to memory of 3332	116	file.exe	sc.exe
PID 116 wrote to memory of 3332	116	file.exe	sc.exe
PID 116 wrote to memory of 3332	116	file.exe	sc.exe
PID 116 wrote to memory of 1828	116	file.exe	netsh.exe
PID 116 wrote to memory of 1828	116	file.exe	netsh.exe
PID 116 wrote to memory of 1828	116	file.exe	netsh.exe
PID 4392 wrote to memory of 868	4392	ilibsuoe.exe	svchost.exe
PID 4392 wrote to memory of 868	4392	ilibsuoe.exe	svchost.exe
PID 4392 wrote to memory of 868	4392	ilibsuoe.exe	svchost.exe
PID 4392 wrote to memory of 868	4392	ilibsuoe.exe	svchost.exe
PID 4392 wrote to memory of 868	4392	ilibsuoe.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:116

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gcsnkknd\
2⤵
PID:4380

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ilibsuoe.exe" C:\Windows\SysWOW64\gcsnkknd\
2⤵
PID:2184

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create gcsnkknd binPath= "C:\Windows\SysWOW64\gcsnkknd\ilibsuoe.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1068

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description gcsnkknd "wifi internet conection"
2⤵
- Launches sc.exe
PID:5108

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start gcsnkknd
2⤵
- Launches sc.exe
PID:3332

C:\Windows\SysWOW64\netsh.exe
"C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
2⤵
- Modifies Windows Firewall
PID:1828

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 116 -s 1036
2⤵
- Program crash
PID:2572

C:\Windows\SysWOW64\gcsnkknd\ilibsuoe.exe
C:\Windows\SysWOW64\gcsnkknd\ilibsuoe.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4392

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:868

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4392 -s 508
2⤵
- Program crash
PID:4640

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 116 -ip 116
1⤵
PID:2004

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4392 -ip 4392
1⤵
PID:1124

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\ilibsuoe.exe
Filesize
14.8MB

MD5
6ad342b21088f369347c00188d59d3a5

SHA1
466352fc1bb2538f18e424e682a1fdeecbc79043

SHA256
5e5fa24125a1421adbbad143ae5a80ebd5683cec2232f51877afdf29c4d1ebc7

SHA512
da0ed0e83e734c133c9803dfb27ccae288bc73fdc7ba0b67e6eda53d46e2261d966dd6fa60a2c469d850fade79e2c1d6d8f7927723148c2ecce30b59653d0bf7

Download Submit
C:\Windows\SysWOW64\gcsnkknd\ilibsuoe.exe
Filesize
14.8MB

MD5
6ad342b21088f369347c00188d59d3a5

SHA1
466352fc1bb2538f18e424e682a1fdeecbc79043

SHA256
5e5fa24125a1421adbbad143ae5a80ebd5683cec2232f51877afdf29c4d1ebc7

SHA512
da0ed0e83e734c133c9803dfb27ccae288bc73fdc7ba0b67e6eda53d46e2261d966dd6fa60a2c469d850fade79e2c1d6d8f7927723148c2ecce30b59653d0bf7

Download Submit
memory/116-134-0x0000000000860000-0x0000000000873000-memory.dmp

Filesize
76KB

Download
memory/116-144-0x0000000000400000-0x00000000006C8000-memory.dmp

Filesize
2.8MB

Download
memory/868-139-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/868-143-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/868-146-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/868-147-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/868-148-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/4392-142-0x0000000000800000-0x0000000000813000-memory.dmp

Filesize
76KB

Download
memory/4392-145-0x0000000000400000-0x00000000006C8000-memory.dmp

Filesize
2.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads